Show HN: CategorizeOnce – open-source web app that auto-categorizes transactions

Why I built this: I don't trust any website that asks me to link bank accounts or upload my bank statements, but manually categorizing every transaction is too tedious.

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My favorite feature: you can use double colons to add structure to your category, e.g., Income::Salary, Expense::Grocery, Saving::Investment. When you export the result, each level becomes its own column.